Enerpac V-44 User Manual download pdf

IMPORTANT RECEIVING INSTRUCTIONS: Visually inspect all components for shipping damage. If any

shipping damage is found, notify carrier at once. Shipping damage is NOT covered by warranty. The carrier is

responsible for all repair or replacement cost resulting from damage in shipment.

Carefully plan your system by selecting components designed to perform the intended operation and which will

adequately perform with existing equipment. Always check the product limitations regarding pressure ranges,

load capacities and set-up requirements. The system operating pressure must not exceed the pressure rating of

the lowest rated component in the system. Read all CAUTIONS, WARNINGS, and INSTRUCTIONS included

with, or attached to, each product. Follow all safety precautions to avoid personal injury or property damage

during the system operation. ENERPAC CANNOT BE RESPONSIBLE FOR DAMAGE OR INJURY

RESULTING FROM UNSAFE USE OF PRODUCT, LACK OF MAINTENANCE OR INCORRECT PRODUCT

AND SYSTEM APPLICATION.

Contact ENERPAC when in doubt as to safety precautions, or applications.

SAFETY FIRST

L-1730 3/92

Instruction Sheet

V - 42 / V - 44 PILOT-OPERATED

CHECK VALVE

Pilot-operated check valves are used with cylinders for

temporary load holding.

Cribbing and blocking should be used for

extended periods of load holding. Without

cribbing or blocking, no one should attempt

to go under load.

Installation (see diagrams, page 2)

Install "tee" between retract port of cylinder and cylinder

half coupler. Install p.o. check as close to cylinder as

possible to eliminate potential leak points. Cylinder,

pump and pilot port identification marks are stamped into

valve bodies. Install p.o. check valve between advance

port on cylinder and cylinder half coupler. Install tubing

between "tee" in retract port and pilot port on p.o. check

valve. One-quarter inch O.D. steel tubing, with minimum

wall thickness of .049" should be used. Tubing should

be rated at a minimum 20,000 psi burst pressure.

Operation

When flow is directed to the advance side of cylinder, oil

will flow through p.o. check valve and raise cylinder

plunger.

When flow is directed to the retract side of the cylinder,

pilot pressure is supplied to the check valve. This

causes the ball check to unseat and allows flow from the

advance side of the plunger to return to the pump

through the advance line. The V42/44 have 6.5:1 ratio

system pressure to pilot pressure.

Example: With 5,000 psi on the advance side of the

cylinder, it will take approximately 800 psi to open the

p.o. check and allow the cylinder to retract.

Note: On systems with slow cylinder speeds due to

pump flow rates, cylinders may not retract smoothly.

This is caused by the low flow of the pump not

maintaining pilot pressure. In this case a ‘meter-out’

valve will resolve the problem. A valve, such as a V-66,

installed in the advance line and partially closed would

restrict flow out of the advance side of the cylinder, and

allow pilot pressure to be maintained.

Cylinder must be on a firm foundation to

prevent the p.o. check valve from being

damaged.

WARNING

1 2

SAFETY FIRST 1
RINTED IN U.S.A 2

Summary of Contents

Page 1 - SAFETY FIRST

IMPORTANT RECEIVING INSTRUCTIONS: Visually inspect all components for shipping damage. If anyshipping damage is found, notify carrier at once. Ship

Page 2 - RINTED IN U.S.A

REPAIR AND SERVICE INFORMATION: For repair service and parts contact your nearest Authorized Enerpac Technical Service Center.The Authorized Enerpac

Related models: V-42

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Enerpac V-44 User Manual

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Summary of Contents

Related models: V-42

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